[FFmpeg-devel] [PATCH v3 11/12] avcodec/libx264: add support for writing out CLL and MDCV

[Andreas Rheinhardt]

Vittorio Giovara:
> On Mon, Aug 21, 2023 at 9:49 PM Andreas Rheinhardt <
> andreas.rheinhardt at outlook.com> wrote:
> 
>> Actually, x264 allows to select only eight or ten bit bitdepth (or both)
>> at configure-time. IIRC opening the encoder will fail if an eight-bit
>> only libx264 is used when one tries to use a 10bit pixel format.
>> (This is actually a regression since x264 version 153; with older
>> versions the codec's advertised pixel formats actually match the really
>> supported pixel formats.)
>>
> 
> This changed a few years ago, x264 supports both bitdepths in a single
> binary since 153 (hence why the codepath got updated like so)

But if you use an x264 build that only supports one bitdepth, you can
run into the regression I mentioned (and the test will fail if you use
an 8-bit only libx264).

- Andreas